下列各句均有一处错误，请指出并改正。

1. I often by bus to school.

    ________________________

2. He takes him ten minutes to have breakfast.

    ________________________

3. In the Japan, most students take trains to school.

     _______________________

4. They haven’t to take a boat to get there.

     _______________________

5. She played the football last Saturday.

    _______________________

倒闸操作的基本条件之一： 高压电气设备都应安装完善的_____装置。